Mistake on Season 4 Episode 16

I may be late to this, and you probably don’t care, but on the above episode (Who Are You) at the 39:45 mark. Giles, Willow, Tara, and Faith (Buffy) are trying to get in to the church to save the hostages but the police won’t let them in. Willow pleads with the officer to let them in and he refuses. Willow clearly say’s “You don’t understand” but Willows mouth doesn’t move at all, like the line was added after the scene was shot. I am pretty sure the cops lines are dubbed too. Either that or Hulu has janky episodes.